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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd95f38550a9645c5e7629c57b0d2e94cffa83b95e6e8d80046d16fb03c58587' 
  AND token = 'nqS/QO5dgSdDlGypuSW3naoa9odX6tqwH7WaJfPNeR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}